I've been making broth for a while now, but am going to start a new batch of chicken broth today and thought I'd get your thoughts.

I usually start it with just water and a splash of ACV, then try to keep it cooking for as long as possible, until I can tell the bones have demineralized. I've tried making a second batch with the bones and it just seems that I lose a lot of the richness doing it that way. In talking to the woman who provides my meat, she said she does it the same way I do.

For the questions:
--Do you use the bones more than once?
--I bought one pack each of chicken backs, necks, and feet from the Farmer's Market, along with a bone-in breast with skin. Is there anything else I should add? (I've made broth with a whole chicken before, but I've had the most success with these things so far.)
--Do you do any seasoning in your initial broth? My brother and I are in a debate over this! I don't put other stuff in it initially, but he says it's better with onions and spices from the beginning.